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Effect of nozzle external geometry on the pressure and shear stress exerted on the surface being gauged in fluid dynamic gauging |
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| Authors: | J.M. Peralta Y.M.J. Chew D.I. Wilson |
| Affiliation: | a Instituto de Desarrollo Tecnológico para la Industria Química (INTEC), Universidad Nacional del Litoral - CONICET, Güemes 3450, S3000GLN, Santa Fe, Argentina b Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK c Department of Chemical Engineering, University of Bath, Building 9 West, Claverton Down, Bath BA2 7AY, UK |
| Abstract: | Fluid dynamic gauging (FDG) is an experimental technique that exploits the behaviour of a suction flow through a nozzle located near a fouling deposit to determine the thickness of the layer. The nozzle does not contact the layer but the shear stress imposed by the flow could cause it to deform. The effect of the external shape of the nozzle on the stresses on the surface being gauged was investigated using computational fluid dynamics (CFD) simulations. Different nozzle shapes were studied using a 2D axi-symmetric computational domain. CFD results were validated by comparison with (i) a set of experimental values for the normal stresses acting on the gauged surface, and (ii) an analytical solution for the limiting case approached under certain conditions. The results obtained for different simple geometries show that certain desirable pressure and surface shear stress distributions can be obtained by selection of the appropriate external nozzle shape. |
| Keywords: | CFD Fluid dynamic gauging Sensor Shear stress |
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